Get rid of el-get, since golden-ratio is on ELPA
Add golden-ratio and cus-edit+ to packages
Move golden-ratio enabling out of init-packages.el
Change to the 15x as long Monokai theme

Previously, I had been using a manually installed copy of Molokai, from
the days before package.el. I'd made some minor changes to my local
copy, so I had to keep track of that particular instance of the file.

The up-to-date Monokai theme on MELPA is >3000 lines long; the version
of Molokai I was using was ~200. That means it has more support
for... stuff, by an order of magnitude. This matters to me :(